Sixth Street Viaduct - Milwaukee, WI
This cable-stayed bridge carries Sixth Street over St. Paul Avenue and the Canadian Pacific railroad tracks just South of the Milwaukee Amtrak station as it crosses the valley just to the North of the Menomonee River. The bridge has a total length of 671 feet with a 195-foot main span. The pylons are 142 feet tall.
If we don't figure out how to change human behavior toward sustainability, we're basically screwed, I think is the technical term. (Paul Ehrlich)